Michael (School of Oriental and African Studies, London, UK) Twaddle 
The Wages of Slavery [PDF ebook] 
From Chattel Slavery to Wage Labour in Africa, the Caribbean and England

The transition from chattel slavery to forced labour in Africa and the Caribbean during the nineteenth and early twentieth centuries has commanded increasing attention from scholars in recent years. The Wages of Slavery tackles this subject from a protoproletarian perspective, studies new labour regimes in Africa and the Caribbean, and discusses work practices before and after emancipation the nature of the working week, subsistence and surplus for slaves and free person, and labour negotiations and confrontations.